81069223 has 2 divisors, whose sum is σ = 81069224. Its totient is φ = 81069222.

The previous prime is 81069221. The next prime is 81069253. The reversal of 81069223 is 32296018.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81069223 - 2¹ = 81069221 is a prime.

Together with 81069221, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81069221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40534611 + 40534612.

It is an arithmetic number, because the mean of its divisors is an integer number (40534612).

Almost surely, 2^81069223 is an apocalyptic number.

81069223 is a deficient number, since it is larger than the sum of its proper divisors (1).

81069223 is an equidigital number, since it uses as much as digits as its factorization.

81069223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 81069223 is about 9003.8449009298. The cubic root of 81069223 is about 432.7980913578.

The spelling of 81069223 in words is "eighty-one million, sixty-nine thousand, two hundred twenty-three".